Hi null
Hate being the bearer of bad news, but it does not sound good. If you can repair the card enough to get it to work long enough to back it up, that's one thing, but chances are the best chance you have is paying for a memory recovery company (which will most certainly be hefty) to do it for you.
I suggest you start from the manufacturer of the card and see if they could recover it for you, otherwise try a company such as crucial. they have recovery programs.